128937197 has 4 divisors (see below), whose sum is σ = 136521756. Its totient is φ = 121352640.

The previous prime is 128937191. The next prime is 128937203. The reversal of 128937197 is 791739821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 791739821 = 59 ⋅13419319.

It is an interprime number because it is at equal distance from previous prime (128937191) and next prime (128937203).

It can be written as a sum of positive squares in 2 ways, for example, as 121242121 + 7695076 = 11011^2 + 2774^2 .

It is a cyclic number.

It is not a de Polignac number, because 128937197 - 2¹⁰ = 128936173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128937191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3792254 + ... + 3792287.

It is an arithmetic number, because the mean of its divisors is an integer number (34130439).

Almost surely, 2^128937197 is an apocalyptic number.

128937197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128937197 is a deficient number, since it is larger than the sum of its proper divisors (7584559).

128937197 is an equidigital number, since it uses as much as digits as its factorization.

128937197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7584558.

The product of its digits is 190512, while the sum is 47.

The square root of 128937197 is about 11355.0516071042. The cubic root of 128937197 is about 505.1954241529.

The spelling of 128937197 in words is "one hundred twenty-eight million, nine hundred thirty-seven thousand, one hundred ninety-seven".